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公开(公告)号：EP1120013A2
公开(公告)日：2001-08-01
申请号：EP99948311.8
申请日：1999-09-17
申请人： ATMEL CORPORATION
IPC分类号： H04S1/00
CPC分类号： H04H60/04
摘要： An integrated, multi-input audio mixer (80) receiving a plurality of analog input signals (Ain-1AinN), internally digitizing the analog input signals, digitally processing and mixing the digitized input signals and producing both digital and analog representations of the mixed inputs. All analog inputs (Ain1-AinN) are applied to half of a full delta-sigma analog-to-digital converter. That is, each input is applied to a respective delta-sigma modulator, but all the delta-sigma modulators share a single decimation filter (89). The output of each delta-sigma modulator controls a respective multiplexer (Mx_1-Mx_N) having a separate input channel for each quantization level of its respective delta-sigma modulator. The output of the multiplexers is selectively applied to a summing circuit (85). The output from the summing circuit (85) is applied to a D/A converter (87) to provide an analog output, and is also applied to the single sigma-decimation filter (89), which recovers the mixed data from the delta-sigma modulators.
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公开(公告)号：EP1639701A2
公开(公告)日：2006-03-29
申请号：EP04753501.8
申请日：2004-05-27
申请人： ATMEL CORPORATION
IPC分类号： H03F3/45
CPC分类号： G01R15/146 , H03F3/21 , H03F3/45475
摘要： An integrated circuit (IC) uses a current source (420) coupled to means (460) for current-to voltage conversion to reject the unwanted high voltage signal (VHV,) and detect the wanted small voltage signal (VSENSE). In particular, the current source produces mirrored currents (I2, I3) proportional to the high voltage signal, while the means for converting current to-voltage rejects the common-mode current ( I2-I3) when there is no small signal voltage flowing through a sensing resistor (414). On the other hand, when the small signal voltage exists, a current flows across the sensing resistor and disturbs the balance of the current mirror. As a result, the common mode no longer exists and the means for converting current-to-voltage converts and amplifies this small signal current into a voltage (VOUT) proportional to the small voltage signal.
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公开(公告)号：EP1639701B1
公开(公告)日：2011-11-02
申请号：EP04753501.8
申请日：2004-05-27
申请人： ATMEL CORPORATION
IPC分类号： H03F3/45
CPC分类号： G01R15/146 , H03F3/21 , H03F3/45475
摘要： An integrated circuit (IC) uses a current source (420) coupled to means (460) for current-to voltage conversion to reject the unwanted high voltage signal (VHV,) and detect the wanted small voltage signal (VSENSE). In particular, the current source produces mirrored currents (I2, I3) proportional to the high voltage signal, while the means for converting current to-voltage rejects the common-mode current ( I2-I3) when there is no small signal voltage flowing through a sensing resistor (414). On the other hand, when the small signal voltage exists, a current flows across the sensing resistor and disturbs the balance of the current mirror. As a result, the common mode no longer exists and the means for converting current-to-voltage converts and amplifies this small signal current into a voltage (VOUT) proportional to the small voltage signal.
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